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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797bba9233b6d77fbebab53006167c62c39d957eac61d7fd92fe879efe0fd59d' 
  AND token = 'VatpnDxWxE0v6wG2+RRbkdBLcZS70BxthzBVNc99vXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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