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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeba1cb159c1616f352988300220705d03be15bf8d27d1a60390532fed0226d1' 
  AND token = 'no1GjGNLT0jtu05+zHMIMmrXHsoCuQ8zbcEV67HTtfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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