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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1e0a483203658946c7926494e4860eb5fbfabad8f04f0d1d6f00617b602057' 
  AND token = 'pyig9J6qdv72L+OCSTosVTTp3HbkZDldbI2Yku3rHPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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