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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07946c9479ad13a68051794e2e00d6c69d441e96c343906a3926d1393534a995' 
  AND token = 'w+39xVUsPPDHP+U2DsWhm1OOre9ZHj3op0N7RYBIq+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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