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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff13ce08a7292890f0d69ae95f49427b58c113d8840455dd2757cf8c85a693b' 
  AND token = 'iQtSSyGmJl6weMra/kgHouJgwUyk6W1ZqRtx7MxRsPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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