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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79397d2ec0268bb0d26f73f19b46af3339845c68c853fcefe43a700950e67b13' 
  AND token = '+TPPXNBWEWk5GYvZdASIYvLxq7RHiGdX9SZjXY21A08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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