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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75c392a00e574fdfe9e2917300ae6ad01c196d3897ac9a72e258d7cf01689a6' 
  AND token = 'kox8zd8VFXJnccLZRerwzM2Ut26+7WvITS9R6G6OWJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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