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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9879f569adf2233454fd1c76f73f8e2d770ffb41801794a61077abdf5b7c0596' 
  AND token = '1X328OX3qlJEUEAQ+MuoT+J8oYAmTm+un5Vr/zaW/6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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