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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1805276ed0aa5a0dc500cb9f4436ca6b1b93e18f577257c35c39f094fb09ce70' 
  AND token = 'tgWrRUXOwryhL3ryAsAqC/mO8c+f3pRHyUjHvNERZrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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