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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39c2e6fc1edb5000956cab700a3b1a55221999c8ef2db9775983892692e9428' 
  AND token = 'inMMH82n6S2pHvU0VHLCC6qclA6xHIKX5xdXxmp/Gis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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