SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ad7e8354795f0ea35eaa1b30557be1314d22d6de499cc858ba0c8822479c06' 
  AND token = 'yZf/5eBANKcNmzFMvqFBcYsd2KOhkyLfguyuEwNf+xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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