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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bd23ae32f430b69d8eee111a74d585c0e1b87a688de8705241f6e2bd06e002' 
  AND token = 'J76x5QI0IBPa/mb4mDijqNQDonpFxLgn3oRcaYF4Ge0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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