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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da65377cc2ee275b3fb13ee6c8e28fae657c2f7bd88c2018ca308e14fbbcdb9b' 
  AND token = 'Pa9x59TcapuzrM6gIRoPNTCCofJnfS8ozU6KF31CxSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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