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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a195c36b58a48f090cbe2b9d049974f6dc91514d11cf64dbf7875d32792546c' 
  AND token = '1kef2NznOWn7YW+gQ10tXfTslgyQ0ZwKE4Tg7l+yVu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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