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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03572eb62771d716b1b07f05ea40e08df5106c4900bb6db9cb1e3c9fb05fbd40' 
  AND token = 'Wbzi4J0GWkZcUL7B5zYoVtHh6m7vbg7wIJbKO03im5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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