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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c25b082c740e5625770c88bb0773954b2cfe5e94d77f517d7a515d044384ae' 
  AND token = 'vZyOYz+fQSx6To8TCZ6AgXJjz9tOSUIKZARoiJo1SaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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