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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b120c3a378bd325945738f35f31d1396894324204c9fa47ee3e32e5ee45777c0' 
  AND token = 'WPp2j9eGKze8bYUwgPW8D2TPnF2Z94NEiax/W4O8YYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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