SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f43e87a538a1746e93f1ad320d8253c4aa69546de58d0bb20a6fabc32913a05' 
  AND token = 'mZ9UbUMcsTZwgYD7Eim6uwGv2qE/aKRS8XCwDWHHg2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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