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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb6f912c6ad759dea04324030f25afbec832af0925f3c962e29ed42163c478a' 
  AND token = 'OXWgmGe5UsEP1M2+dUnSWdj15WfL7DvOTDmr+L5nKVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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