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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dbfe20e1686b9a4c1783bda108071350d44998051271b41d55931df658a3d5' 
  AND token = 'KzGhlV8U5DNflP9d5A1kiCRBAIb8PIQby2wRxv/WV7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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