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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcb0d7430a202941ef17175cd9520892b71a4e1095fa93f37f5c4b6e77ca0bc' 
  AND token = 'Ylk1zvgMPw23vAy1a38PVZiMkNRUGGlUJkqoxAzFf5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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