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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591b1e657b08858061fe9c7992a04cbae95c779cc9179b25675bded7d1624b7a' 
  AND token = 'KUzbw9iantCo94sdl5EUtx/YRzTt0eiBZ2UEmfWucOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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