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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd4e26bd254e4b4722750f355d15cf73feed4f446a73877030996f76341a748' 
  AND token = 'BQBqJZV0Xi9Tf6a3kB+g7X2g2JJVU4EQeyQvnO1lp0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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