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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3179858b69523a643f3caf2fad7670cae14df8ab089626c98def82f813a2e36f' 
  AND token = '2wsMsfTTDlKWg3zSuH5CSkT10MWITmc5FTCXVzQOX4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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