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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eec46bbb05af8ab99aef89b313e5451b81cbc5e1b298a4b84133a872eb0b1f' 
  AND token = 'v6dhC2WaB0uJwVGHofEzLs6KCwJhjl2FxAr7CcOs5NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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