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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b115bc932e1373647aca3539363087b2db97eb780ff8a90de22b5737c0ce6e2' 
  AND token = 'E8BDOe+yTW+wJbBviIwo3phVFnl1+yM6hi2/++5d8E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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