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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab2dcdd307e73830d22b777b14ed42e0faafa0e4c0452d6858cc7f6d8bbc1aa' 
  AND token = 'cxmkYdyj49mZlli9Eky7vn27ptjjKGdjVRznV2ylMb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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