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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79cb91c480ee40d20204a23925c62347a6c8ea369277b488d37af7891ad818c' 
  AND token = '4/bC8VX5nUwXsjFUcQPrAmBYcytxlXpqVM0YUSJHy/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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