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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717a822c781a7e0ce66e69e32a5981f5eb241797003835ecbee9b2efa18f7cc5' 
  AND token = 'Wu3Nxuo58imfHwELvdr+qrp/xjK09Mg8x3D7STFp4Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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