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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17895c964448763ecf4c2af9716b342c366d20f0f12b66629418c16bc0279400' 
  AND token = '1V351ZRJ+7tffA28mtDITwsFyu4YRxBIgO7kA7KJ8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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