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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2282c27dfe086028571cb9c31074699b9c1eef23708367d364a6d0920f7bf5' 
  AND token = 'YMbMA1VN07NlJKrPsd2ZIx4u/axF9GRjIzTVLGk3a/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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