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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a8514f2e85c737ebb94689c041d915fe660e9ced4f9961744cb0f174c7fd94' 
  AND token = '1zA6orevG9icw4iwsRmQM2bRTHdl3c3yxnfwOsASDN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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