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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beebc123c26ba947ee2c47b9b8937170ddb637abb59264c328e5ec02a3ada0dc' 
  AND token = 'HvJ8uCU7bqmM5nl5nanISjE/GUiMGVw14Ih4wYXBwIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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