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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6c98d5927b7048805b873a55a2b94b5adcee28f91f9ed5a4a2e0bdefcefb4f' 
  AND token = 'NoHGfaTf4OAxpBTRCqKGDgHeB+7cY/HiDi3O9oHazaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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