SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66083b6d5467bd99eb8baf45521ff44f927951f6b22fe2c2bdad189704a8abed' 
  AND token = 'YhV8uN4agBmQvaUlbrN1GrSU7WIJqzsEpR0u13B3LNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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