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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77705e843bb3478f877c4f70a21725bbcd98f3451306e8634b76a01e5dd16fa3' 
  AND token = '8jOiUMN6druEj/oK9T7Uis9lMcTnWfBKFkhNKT6rSb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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