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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7164bc25eff5f04e29c3f6620a9e796a66d82b2465ccf696da90cd58a96f63d2' 
  AND token = '1bRhC/fEtFGONfdJ6/kzEQlDobdtzH9sLj4zh4YnElw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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