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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0ee53623e45ab293a4bde438c9d43172e2c94dcd0fe0b8832ae462ccbb6d02' 
  AND token = 'PCu6kHFxFXjZv0bzAZdeKe0R+aHXCdMuvH88TlR/PvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}