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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bab04e19bffb400d4dc6d682780867cdc30bf4a0f2b5fcf18efd22704e9db2' 
  AND token = 'nPWxIpBmWCb5REaQkNp33cQUrDLp4KneX3OSBIFG2vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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