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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0506b74404e1f53ae2cd55bbc9820db3b23c4accab365d4291b9fb085c2ba122' 
  AND token = 'apA/CaU1jxF9ffsTnYQ4LNiPZxSLTjaWr6kwmAfTmD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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