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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80611ac1bcfc65f676f3df0f08b92e06989ea241ea6f88645ffd594df0eb9f7f' 
  AND token = 'lNsqgZCGJ2nIjwWrgkoZx20RMd98dxg5b0HK4jEN91A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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