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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad13c93ca70b7ec19c3a9955250490e633b9ffaf4a59cb10da4eefbf6e3e31d2' 
  AND token = '57GdGwuXgjb62zO1Y/Add8EE4UbwXSY26TlQ6H+AiZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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