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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8147fb8ee9adeca9d6e721f0063471318667e465613083032bb130f5dd7088f7' 
  AND token = 'k2115LY84+anJGzp6t8FE9OjQ/S/1sS38RMSDX+xL9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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