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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c445a755afa39b73db018e5bf5e8cbe363141c40520457d23783b8df6e64a8' 
  AND token = 'Y5M24Wh1rerNjA0WBYbzVaoQF5murSdp/L2qgZUMncM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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