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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8197bf0c09d01bd91d9da63be1b3f99f15d5eded31316bfcd3ef701eb0d6db1f' 
  AND token = 'yST2ZXj/VzIXz98DWUjJAcXqEIzBEIWR+7mEp6+1QhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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