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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa8a3cf012efec24bca453ee8d862f911704628a3e628bb7ad7f40f79a8981d' 
  AND token = '455tESZD5kAqQ6m38YcdoiSYJm7QjV/jQo8dBtEjZGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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