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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6592c8ecaf65a6df75154c5b8851bdcc5e17635858fcf595a8117a2ab0b610f7' 
  AND token = 'AQA+0Z3TmcfqiU6WILCo4aXQJBCicFwO0CTWbjaCgTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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