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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35504e6274ddf38d808ce9aa49c442a5d9f2df3b9d3048ee9cdd11ce5c43cbad' 
  AND token = 'wAZjfNkhidTuxOTQBz/su8yeRH+WAoq1CIXOXtJybCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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