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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea0bf48148378d9194cbda8a3920108112cd2e06ca61a24a5fb0a4dd152f550' 
  AND token = 'pW6drijzOuv1VUVRXMduSz4R9rBKxl9o2rn92TWzP1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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