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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c233f2ff8ab4a33d0f90a76e678f4814dda145fed13e28d60b9baa6e8cc1ac' 
  AND token = 'ZEuVzJ8Goku7Ogyw4BnqdJWWZC5xdEUkMy6zMunmCwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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