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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cf7ff81eb7ba369b6c19d1bfc7a9c7f78d70c63349353b0ec7c8d8d40ac89c' 
  AND token = 'uN1m++FNaRLhOTqalywtW38hB+AZr0YabWpbgmDJqOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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