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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2811e94890633295d5f88c21e2acd6e101084071a4f34da59d2763feebf9c4c0' 
  AND token = 'Hp4i11SiaogBJpoduDp1d8JbKcLcv4fuCr02ZdEfcn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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