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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db84b47f28ca7760b5e5029c419cb2efae4b6382035063e632de069266923121' 
  AND token = 'dA2MgsZjhmKENp2Opw0C+OiTlWUXq657kJxuMJ5kDjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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