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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bca2e8d3ad70c5c8c41dbfcfcd52a223aaefda81b9bf2fe0906ccb11644314a' 
  AND token = 'PX/SmJIL0q1m77Gn6JXbXwjOe49wa248XAJiTyIdFpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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