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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a776b069eeeb6a0c935f7b116c03f9735faa8b8ed48a79e6556d12f9175c71f' 
  AND token = '2xWGT2Bh22p+3VOxgf6dUZSH561HMy3qMVWvfTPnV84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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