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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e2e4e5eda18bb231c5eba8e1b278712d8f177a954ff41ca40df07b69857b6f' 
  AND token = 'ovhXYHq0TAUCba8mqZboG87H6OTski8OI7My0rbDfic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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