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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ebe14b69fbc5c7e5cfbfa88866a336a510d10f7f0a86ef064f09a0be2c0328' 
  AND token = 'OzvNnDa7tqQGUm/fI9OPlepjhRUHzN8K9xG9+ec7ZQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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