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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cad0d19b67ef0bee13d63d98a801e7334cf88e206bba14fcbb94e427609af39' 
  AND token = 'KXd7uAnEPjRV5qu6ccD5GF7ax41M1lmRpk1mlCO+cn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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