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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f971ee1bdd7260f6e49b11dc5ccc653349fce30224a7be0542102b17f44841c0' 
  AND token = 'kmF2rLafEuw3wOXUFEcuMB6z7PwtyWGI6S36exgj4M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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