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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802bd8ff3354e7eb02adeb5fcea06fb2d649623116b82b8cc42061656e0ffe16' 
  AND token = 'xFxyOqC5azzfmHawLKuthdwd52QQUad99uDnXPUwLiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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