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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5128ceb0d0277c2fae8ed7fd3a1ac5ec8eac5af86be7a5f4ff355d0a7d3b13a0' 
  AND token = '4bl+21QYBbztQi/LETfWg3XnGsNrIAxbOKv8Ng9AD+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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