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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42056a0ef96735299eeebcff3f40385adebb82af8965e3a2dc976b359cac3d7' 
  AND token = 'ypJ9rp9CKSUVZ1H9dydx+T11ww7do+dvI5voKxj7V/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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