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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3579df0e83fa1e70d2a0bde8d7ede2c481dff36a377048ec4b7e93ff4509d16' 
  AND token = '5/11LATuo+86OVzt+QA1NsyE7+MgaHqAZSknPS3qwYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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