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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8290056bf459f1fc81ebabafe167880a4989c4bbfd3dc3d55949d2356e846e75' 
  AND token = 'JOqCIDrxA3EcyGeXdwLS57mGETnhOZPEUg29Nde5hhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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