SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca33b0c3addc788d8f40e6fbbc5ef8651f7337e4c86590c1723b439ef267b2f' 
  AND token = 'Hm4gT+LAKr7na7CtaBLKHlju1wTwBX7sObuoWhVGSHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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