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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c7a496bf3332c0159913350848576216e2e26c741986a64f5ab1068ad6e76f' 
  AND token = 'cgZ6eowJoxZlZf/307xcyyvHaTHL0JbRMKCsAJWUUt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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