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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db241606f5eb3517d580de13d3df2f1f64bf86d2dff9f60a122e41062ccd773a' 
  AND token = 'nPaWmYXlYc07gOycrCNo6N2WToKlGPAK2DHNF+0gM74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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