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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1c8856e419d9f8d7de270c9adfe6242b0f009a5434caceae87308ac8d135fa' 
  AND token = 'w+WEBiZH9TJ/bxLRywf1uVI8T7alPO/G9HuQRw8JC4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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