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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23a7cb3ce6173a3ad8f10cedab5a4ebbd8413759ab8b0c318a551e28126f583' 
  AND token = 'K630xhbZw4aYWIgJq0HYBzQeh13YFzEL+N9EonTPyrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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