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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf225c27387842f77fab46b13e6db8c660479eaaa1a486a2874800b3f17e6af' 
  AND token = 'bdA9k0txTdll83BU6Lb7hYBaFpQZZmALT0/EzjFg+/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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