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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6602567287a14db23d35300e986f77708b0fe96fb99cab0831e5ef9c6005e1be' 
  AND token = 'TlwsudeSAbog/EbRYbkH0xA7GW/kKDRN9Y18iDRmV7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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