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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e13491a255c72f710dbd9c03a43615bcc541fa904be7f1d5a8708c4b5cc683b' 
  AND token = 'fr1kUt/iaiLKA97xNKYMDfE2s5lYV9IpWTFdBmAMgnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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