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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086a8de113d44d2d7a7c190e7850c48677e9e5a68839a35eefb9a974b9d25575' 
  AND token = 'uVeoydWdjq4l1FnUDznd7PiaNcUZES5niSCKQwRJVqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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