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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713e701d73f4f177fc61e001078b87940cc565c1102062a7f38c0b3177e84978' 
  AND token = 'j1CfIlLEX2YRQOjZmEZYqUMcExCLXKG68T7shC94Dvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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