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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995ff84b47ef77017509c844fba02cb66bc70ad30cf12dfc71ad78295abc9937' 
  AND token = 'Kp6w4EpsQ5jU8MzIx/iWSVxn6DXlHy3tVSXaXk19/DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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