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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98e9a28cce9a4b627c30ebe720d7f4d45c7db6a085b5445ce5d22100292e36a' 
  AND token = 'LwrahWr4JDcLiI9WZEApEUYbdBDVTZdYeclMQ4m5U7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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