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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2650093e13820171d6eecf5d62ea685e342d2f5f80263721b84259c93bac62e0' 
  AND token = '4t4EvKz3VstW6gey8ioGh5QpPJUo8Hp2irYeprxJxso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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