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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b80d9ae9b5e9fbae5a2e3e8357e43e2a573ee37a1a427cc0c5390381c9e0fc' 
  AND token = 'U/YOvSdij5B8P7YSaAzfwdw3MP6Yc7HSYN7AXEMvTLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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