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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdecc24f9a61a94b8ade406d33f63a7da37720be7fb5a3d362852ff67995469' 
  AND token = 'S2+MozH0xGraokbavsKz6NFix+/bBWlpnekrd26ehmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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