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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c992b32c7e5cd9cf295810633db6d59e5c6c680c30ab08501674b03dd22b5684' 
  AND token = 'KIXreg3BpTSg9IidySMJW1aY5ay+XvXDD/kKyksKzmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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