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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ef66a1358b3e9f478edef5eefc458b974397d5b86c33ebcaf01591fe7dbdd1' 
  AND token = '5TdIaugmtffKOKrIny8UkL+AbyAKW9ZcxM9NO7jiNhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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