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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3a6ca6263ff44b3dfbc7c49e5a344726e3f6156481a58b5fca978dd544607d' 
  AND token = 'MGMAJ3NMFrnKy8hQlBLd0GpajwneyaCvPWyy8MkJpg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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