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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942363b922bb064cc952c79141ed7032b3c989353e8efc0ff3591fb95da9124a' 
  AND token = '41QS9l1DnHmPR9Z/e6WQvhdGC5rN/JytEhyT/dc8Y30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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