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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477964666e1219a43f1ac5fd614a82f422051a03ddb6f04b6327e5c6c8195c00' 
  AND token = 'NipaEWAF68cht3AZPOaSkk8VKImpr4onj5TqXgSC2VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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